/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache license, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License. You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the license for the specific language governing permissions and
   * limitations under the license.
   */
  package org.apache.log4j.bridge;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.log4j.Appender;
  import org.apache.logging.log4j.core.Filter;
  import org.apache.logging.log4j.core.Layout;
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.appender.AbstractAppender;
  import org.apache.logging.log4j.core.config.Property;
  import org.apache.logging.log4j.core.filter.CompositeFilter;
  
  /**
   * Binds a Log4j 1.x Appender to Log4j 2.
   */
  public class AppenderAdapter {
  
      private final Appender appender;
      private final Adapter adapter;
  
      /**
       * Constructor.
       * @param appender The Appender to wrap.
       */
      public AppenderAdapter(Appender appender) {
          this.appender = appender;
          org.apache.logging.log4j.core.Filter appenderFilter = null;
          if (appender.getFilter() != null) {
              if (appender.getFilter().getNext() != null) {
                  org.apache.log4j.spi.Filter filter = appender.getFilter();
                  List<org.apache.logging.log4j.core.Filter> filters = new ArrayList<>();
                  while (filter != null) {
                      filters.add(new FilterAdapter(filter));
                      filter = filter.getNext();
                  }
                  appenderFilter = CompositeFilter.createFilters(filters.toArray(Filter.EMPTY_ARRAY));
              } else {
                  appenderFilter = new FilterAdapter(appender.getFilter());
              }
          }
          this.adapter = new Adapter(appender.getName(), appenderFilter, null, true, null);
      }
  
      public Adapter getAdapter() {
          return adapter;
      }
  
      public class Adapter extends AbstractAppender {
  
          protected Adapter(final String name, final Filter filter, final Layout<? extends Serializable> layout,
              final boolean ignoreExceptions, final Property[] properties) {
              super(name, filter, layout, ignoreExceptions, properties);
          }
  
          @Override
          public void append(LogEvent event) {
              appender.doAppend(new LogEventAdapter(event));
          }
  
          @Override
          public void stop() {
              appender.close();
          }
  
          public Appender getAppender() {
              return appender;
          }
      }
  }